%I A137317
%S A137317 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,
               2,
%T A137317 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,1,3,
               4,
%U A137317 5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,1,2,4,5,
               6
%N A137317 Array T(n,m)=1+ (n+m-2) mod 26, 1<=n,m<=26, read by rows or columns.
%C A137317 The pattern arises if one assigns numbers A=1 up to Z=26 to the letters 
               in the 26x26 Vigenere square, which contains A to Z in the first 
               row and circular shifts in the follow-up rows (that is, B..Z,A in 
               the 2nd, C...Z,A,B in the 3rd etc.).
%D A137317 Blaise de Vigenere, Traicte des chiffres ou secretes manieres d'ecrire. 
               Paris. Abel L'Angelier (1586). Section 343, (1)ff, "Separated illustrations". 
               Based on Bellaso, 1553.
%Y A137317 Sequence in context: A036218 A025484 A030545 this_sequence A094759 A030542 
               A158377
%Y A137317 Adjacent sequences: A137314 A137315 A137316 this_sequence A137318 A137319 
               A137320
%K A137317 nonn,tabf,less,fini,word
%O A137317 1,2
%A A137317 Paul Curtz (bpcrtz(AT)free.fr), Apr 06 2008
%E A137317 Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 06 2008